Respuesta :

An infinitive is a(n) verb form that usually begins with to and is used as a noun, an adjective, or an adverb 

Taking our knowledge of what an infinitive is, we can fill in the blank of the definition as follows:

An infinitive is a verb form that usually begins with to and is used as a noun, an adjective, or an adverb.

What is an infinitive?

The infinitive is the basic form of a verb, that is, a form with no inflections - no changes due to a relationship with a subject. It usually comes preceded by "to".

Infinitives often function as nouns in sentences, but they can also be used and adjectives or adverbs. Take a look at the sentences below:

  • I love to go shopping.
  • She had to leave.
  • To breathe is to feel alive.

Learn more about infinitive here:

https://brainly.com/question/732192